Vacuum tube and socket



Nov. 6, 1928.

J. J. KUHNv VACUUM TUBE AND SOCKET Filed July 1, 1922 Patented Nov. 6,1928.

- UNITED STATE-s PATENT OFFICE.

JOHN J. KUHN, OF ELIZABETH, NEW JERSEY, AssIGNOR To WEsTEEN'ELEcTEIccom' PANY, INCORPORATED, OE NEW YOEK, N. Y., A CORPORATION or NEW YORK.

VACUUM TUBE AND SOCKET.

Application led July 1,

This invention relates to electron discharge devices and socketstherefor.

Heretofore, it has been customary to provide electron discharge deviceshaving different electrical characteristics with bases of the same sizeand having the same. arrangement of terminals. Sockets for these deviceshave, likewise, beenv made the same size so that any one of theafore-mentioned tubes could be inserted in the same socket. When,however, a socket has been connected in a circuit adapted for use with atype of electron discharge device having certain characteristics, it isdesirable that the possibility of substituting a device having differentcharacteristics be prevented.

An object of this inventionis a base and socket structure, such as toprevent indiscriminate use of electron discharge devices havingdifferent characteristics in a socket.

Another object of the invention is a base and socket structure forelectron discharge devices such that the base and socket are limited touse with each other.

Another object of this invention is to modify the base and socketstructure of vacuum tubes so that tubes having certain characteristicsare limited to use with certain sockets.

Another object of the invention is a vac' uum tube socket which willreceive vacuum tubes having certain characteristics and eX- clude tubesnot havino these characteristics.

Referring now tov the drawings, Fig. 1 is a plan view, partially brokenaway of a socket with a tube inserted.

Fig. 2 is a vertical sectionthrough a socket attached to to a panel witha tube inserted y space therein.

Fig- 3 is a. bottom view, partially in section, of a tube base. 4

Fig. 4 is a side elevation of a tube. fFig is aside elevation of adiil'erent type A panel 10 has attached thereto a bracket 11, a. ortion12 of which is parallel to and d) from the panel. A pair of strips 13and 14 of insulating material are attached to each end of the portion 12by means of the bolts 15 and nuts 16. A pair of contact members 17 areheld against each of the outer strips 14 by means of the nuts 16 and4have their free ends projectin beneath an aperture in the portion 12 oftheracketll, the ends of the contact 1922. serial No. 572,259.

members being arranged substantially at the corners of a square. A shellor sleeve 18 is arranged in the aperture in the portion 12 `and projectstherefrom through an aperture in the panel 10. A plate 19 ofinsulatingmaterial is arranged intermediate the end of the shell 18 and thecontact members 17, its ends being clamped between the strips 13 and 14.This plate is provided with apertures substantially in alignment withthe ends of the contact members 17, three of which apertures 20 are ofthe same size and the diameter of the fourth of which, 21, is Oi.substantially greater area than any of the others. In .the end of theshell 18, extending through the panel 10, is provided a bayonet slot 22.

A vacuum tube to be usedin connection with this socket comprises a basecomposed of a shell 23 of proper diameter to fit within the sleeve 18from the outer surface of which projects a pin 24, which isadapted tocooperate with the bayonet slot 22 to locktermi'ned by the engagement ofthe indenture 26, on the interior of the shell, with a depression in oneof the 'arrms of the web 25.. Carried by each arm of the web 25 are'terminals 27, each of which is of small enou h diameter to be receivedwithin any of t e apertures 20 in the plate 19. On one of the arms ofthe web 25 is a selector pin 28 so arranged With respect to the adjacentterminal 27 that ity can be received only through the apertufre 21 ofthe plate 19.

In the. tubes and sockets designed for use `with each other, theselector.` pin 28 is arranged adjacent the particular terminal whichwill make its angular position with respect to the pin 24, correspond tothe angular position of the aperture 2l with respect to the bayonet slot22. The position of the selector pin and largeaperture will be variedfor tubes of dii'erent characteristics so that only the tube designedfor use with the parthis device Without departing from the spirit of theinvention as expressed in the following claim.

The invention claimed is:

In combination, a vacuum tube socket and a vacuum tube having terminalpins, means associated with said socket and tube for definitelypositioning the tube relative to the socket consisting of a selector pinon the tube adjacent one of the tube terminal pins and an insulatingplate on the socket having a large aperture for receiving both saidselector pin and the adjacent terminal pin and a. number of smallerapertures for receiving only the other terminal pins.

In Witness whereof, I hereunto subscribe my name this 23rd day of June,A. D. 1922.

JOHN J. KUHN.

